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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a7b762f3d9fecd2a0b652817cadf4376b179f05ce60fb19a43ac43c3ca5e045' 
  AND token = 'mGVVKM/Kf33YPA11PAi9rPV+K6k7etQPQwP1d2vIYFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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