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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5c763824eac635215c261c8ba4b7b0c649a6b6f9c46f5676ff61335de7fc4d' 
  AND token = 'fQkQ9kuSDqVDk6G4yZbttST2c4Rlk43i3mlUUsSKfIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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