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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac01ed9a69fa3a63ae7010ae953a586834b93c09554bc6d5fcf9911f1f4e4cfa' 
  AND token = 'E0bX+YhLjWLBOvtBB1cPps/BcD3PaXehAE2la7rhbrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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