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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aac31d4ef059e5be66d72da70b1ee145cee2278fd795c88e631a20e656d26b50' 
  AND token = 'PMb3v1yrDrGP7bb5O5CGLJ8kT7+DjRggrZgwG4ks++Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00108

JSON explain

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