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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1bcfdd6df1c8002bac1445d0b0bbadf004ce13c79b090a51c7cb74587946259' 
  AND token = 'lCLzTzdixcBf4GHi9rNGBrj79I9BZKwLHhs3Bi6iQ8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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