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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '960bc395cfebd89467ca7ac66c95891a45343936d192cdede6ac800154eb1cab' 
  AND token = 'CZgujyP9Vd4yWUIIvm4IMu+jgtsMfg2iG1Rrlto2io4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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