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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd22e24386fb650b47e1b0d9ca387fe51c8ff541b8e8a146fa40c7be14114da7' 
  AND token = 'n0SOLaP1lejBerpVSeTOo7CHtVBmbCs+VXYNZFI2DQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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