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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '020b5fc776f56e4864a3c539e468163eb3651fe502b8b041726fd64c9033e96f' 
  AND token = 'oiFJjy4apPrhZJoh/7kR0N3F8i2PNpsEufejZTnlv2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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