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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20921b4744cf7d0070bc94856c0a2e6298795cde5cde19a8bf559103771bc966' 
  AND token = 'kdvPCjFrbzL6DDG6e2Xhqft6wN0F2wL5WlandFOQBoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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