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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b966b4246db9430b2c4ad50dc0256d40b8c8a89226cd5a6e2aa50525dcc4935f' 
  AND token = 'pm6D3NkYJymdKmWNCI/Bj2In4yYzYZX8V6FukXzo7U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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