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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2d7e986bc19556095c583f9a5114357ca216049409d0eb2762efb8e9047a264' 
  AND token = 'EoXsN8qdhm3W+FjEkmr8dTKEm9mWjS9IV+mHH/kA++4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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