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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f527c111f6d12a6ccf40749db0f17bea9f6910d090d3681c0fbb9a1848a3df08' 
  AND token = 'T2pA+bmJ1nyn8ub+Arm+X4Ptm1JovBj2gR3Dx9VFnKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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