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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3792367103b2e6d32d2247740504a3be315efa559b73e3a1ad230c0e2681f45c' 
  AND token = 'zrtlW/HU2fz4S+zKqJCvKyP+RrcLQODunxeDqrhunL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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