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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f39a4d88d934e2755e2985e75e1584da3e7f790fe1adf2c1aad60f1f15ae092f' 
  AND token = '3+irA+RQEDSehxa+Cu4S1Li0Gzjxu8xzADUXHZvGyKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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