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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68f5316c54f4a9a91bdff4c706cca06526df3102241e1d7cc941126c4a023360' 
  AND token = 'LOzS0ZNF6+tdCS7YR6hD2tCNAHfRRBMDOFicejaDFRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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