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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f99fb02d18d6c8b8ea0226e2d43531f2028d1fed9e01217e61cac2b4d6679ceb' 
  AND token = '5xbJvwL7W8k8+SHuEfm5DoenLkg3yKL+Q7anMasH0dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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