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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79b36d9b74945abb29669ae0b5afd19b4d1059904ca1dba293785f5be6ad18ea' 
  AND token = 'bHX166jVpHi1+rJLcQEwPgvh6GeKS0c4Y38lWSnYZnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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