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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0214c8ed7b562f00c90e29eed11ded7088dd5eb021f8b40c12d52203489088f' 
  AND token = 'z1Rah6K8m9gcFt9T5USafGYew0xALJi495+uhNMU5kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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