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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f16b2a5140430e6033a86d64b50650b014f138312394db8fd128149ae0cc1d5' 
  AND token = 'k+Q9U5ElKxgVX0XWROh4p3Y8XO4545gI/cxRBgMSMHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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