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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75eaca1dd2927acb3da99d494b4d1ff1ce03494dde3b120afca2dbd72d849e6a' 
  AND token = 'sagkv2jHKnuiHYI2ayzu8YSBQlJd3i5RM8focnBI3MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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