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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f85a353902ccd68c6377d3e21f8942cd649fd8ac3da4153943c477dacccf55bc' 
  AND token = 'bpdN3ktAGnU/9tnoJmMfu8FhW1wIV0MVrbDnfxI2Imo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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