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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbf1a47224653558fccc34a46346aada9b4a45554c3e1fe1a7c5c006f4aedee7' 
  AND token = 'SevecAiWQ8ezDhKBldCRdPtDKQ6xRww1E+jCyPfWhQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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