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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceaa1eb9d28ce21832370e423692fd98bd1c1281663c042895e50662609d0d18' 
  AND token = 'SsEyv2RrlCa7f115yF/K1GxB5It4Recaw8Ny05Mt+cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}