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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71fe4a4b02e8ecca01daab37eeb581db9e2941483ad55356acd71da2880f4f47' 
  AND token = 'vwPJlzDRwVp0XvdlzXtAVcmOcYLR5qfFIEknNKA151c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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