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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ed633e3c6a26a6e095c852c1b0eef2a4c18db6d2783be760e25ef9b63f19da' 
  AND token = '1bg72N+WB/ckIXP0Huwi2JLIbltgEajQZpsbkO8CoVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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