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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ee66be0b590f8aef42d4ae0b64962360acee056ad1b1c909a4d710c42a588e' 
  AND token = '+evUWjhPjyMCtvskJTt//AC5FyUaPMcaC45iDS5XpQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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