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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a806cc6bea6b2840ff077d4d99525f3cc854ac3b344c22a9da63b691fc3719a' 
  AND token = 'gQLy+uzTpJVirBM65VABdRSnRZwehR1hh9oMg6Co9yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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