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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bd8cb461fc5d7e8aa6e26ca7444e0ff88aa706ab44679f3984bc6cafdf4bb9e' 
  AND token = 'FbPkf/dbmYkceIbVywgDQGap/x6fRbS8fFvdHheheC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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