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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7756950f831e58e0b01daa57c13b002152c331ce4bcfaa7e1ac3c3d3d26866f4' 
  AND token = 'KCsGicBg5rOQq4hi8RCCsHZcD7QUHRy79rQod05JIEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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