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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '571a98c23dba31e91abb8c9cfae8790a06208f0c2a5236bf152aae054dc02853' 
  AND token = 'wvFumCUzQ7AVFm8py5Trz80/ls4HpDa9WwS6ANsyVTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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