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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffddbc1d10a270a0e43de36cec3cec0c6af8aa06eb96baa44e2a7eec2835743d' 
  AND token = 'mXQlgyGqOdzOYC5sAe/d1POkE/dDn5B/Z/Dd1q5vnfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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