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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cabaa2bf93d1e7c06779ee45e109db448abc7dd86e5667d811f5f93626d2a268' 
  AND token = 'fnMAS6z7IGV+fBTDsyPSM92tCr2YAXApAAXrfW5flyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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