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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc070c3ec833ff5d28524462d3240259c5b46a9775ab9bd290b000c88720be68' 
  AND token = 'XpljzoG8iDsxkfFu4kiVjXh86rEj/tRFCFgXCGDVKE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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