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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d99fab02a511f949f30c2983fa7fb90b9f523580243197bfb284eb37c4b3116' 
  AND token = 'PQtAVf7PRAY0Syu/T6ZfyPZtnuz3xJYCDh2tUHsZ4kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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