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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dce40acbb21677f87d1f6274b63c5d8047dfec301c3274c478c18fc7b683773' 
  AND token = 'W8d+vdHo4pnkufciqbFf4rWb6KY7T1GXB0t0gtmAEKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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