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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '970ff1cc21d1e0ba0685cafc12daeedef3ec975b13e996d2d88d27470ec70d5e' 
  AND token = 'U1oMBio76xb8EaowCS1AuWmIKpX6Sxo3zWRY5Q4ogYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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