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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd131158e82dbda042e59b1f20757858504a027d3e29b905b2ecd8a7a314d89c0' 
  AND token = '7qt49uZ3z++01FTceYD/5D2saxnqxaxMvxcEI5JIP3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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