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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae142cc58ae7fce2c1cab51a2e03296f96f619b70a27a535e00066e3f549f91e' 
  AND token = 'JVvzONAKpHrju/Nm044U6CtcYah9LvJwO7+mom6P15c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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