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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4d86b7470f8126a2e924c4d1500dd6dc45fce8b49e7dac67ed321fdd7f301d0' 
  AND token = 'Nvp/u3lfONUJE4J/zcmRBY953UtxmQC+jt4EavDuEAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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