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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2685cb0113da7c6d87f7de41bb50eb3153d5fbfd9ee06302e9ea529e414fe1e' 
  AND token = 'N15IdSaQAELTO1U4cjS77gZv3g3dA2NCdg4qG+0FDz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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