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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e2afb8cba6bafb8de7e2b5d71d6acb56f165520b2d98d08bab82fd6a49ab3b0' 
  AND token = 'YDAn2j2XLKmeb9A+BeLVubN7wsYNyKhs6/aeGVBfIMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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