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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '267cb1962f4f75f17bb2e26e46efbe828834f16b19a0050f580832d37abf4901' 
  AND token = 'Z1yJZ0isLvAfWjven71nFhwqvmGGdfxSvT38GpQGGCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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