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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3084ac9cd3d60f21b68d064581c946005c3b17e0013f7d2ee7a13d32f9247ab' 
  AND token = 'U/T109hWts8csNQmuRtYrURufG8i0z3ZmE2lur0tlC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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