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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e9bc8c5896d6b976abfce7ce7696afa643c09be6b49e08cbf1944b571e1f0f' 
  AND token = 'ldtP5DHYaoD+nnSkDP2OFTfa7ILUygcX12WDXNbx9EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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