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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '771827094339a9efdf8a569b62397f46eb6a7fb8ed1651be99656c15cadb6db8' 
  AND token = 'mZp6MQ8juIKlUw9ehhScqFAvI0tc55vbu3+CvcAWxHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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