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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6624d04c3e49cb35bc82bc30b7e40860def357f4c648e86c732ddd218851b895' 
  AND token = '/WlRG6nR66wmy18KMavLQVMMTIPTKIVlFgyC4WMupKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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