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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc81f0102403d2609efc2ec7563ca3f57568d5f539aa08e4df6b15e81550fc85' 
  AND token = '+91dyo+eUS4Ybj/Oy7MIedQXBa+GO5H1/jZIKRsxlmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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