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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ef9bee91766f087d6fd944ecbcd0a4b281c1ff86f09e6b2c6e2be29f71cd40e' 
  AND token = 'aiwSp0pnzpW3ccIdlmlegqQCYQ7JNMMdiiO0HkOaepo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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