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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '767f0034dc0a811d653beed195eb9c4a244967643c329cc06a085014d805e555' 
  AND token = 'P2p4h8SCIBmxqCSDnL0wDpvVQNqzSA6/lGC4aplbs1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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