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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3b496ff6409c8237fdc1cb8e0a66dc85bc93962bce54823e9d92cd9dfa476dd' 
  AND token = 'bzWiTMcvmCzUVi+S81cJa03ElX2LBJUJ6Ec8j+tsr/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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