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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90557fdfb3d2ee00bd50fbf7a23828d8dd08442d828c7eb999f3d66d8d126cdf' 
  AND token = 'nDg6e6CuBkZs19UAFjVeRxo8+beaR6Pws5yT05ElEW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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