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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c31507bde9b69e715ed4de8dda1a34c1f47b562f9103bb11f74bf7fcd05e43' 
  AND token = 'PT8GleoShp/NIdeweKYlYb/uYUc2BbNO5y5ZfMJQIRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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