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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7355ddd4e349726b84304a884ef399af93920d77d1f2415a19df75e05fbbef3' 
  AND token = 'oJht6TKi+TM28zpYmp7e0UqgqD97TcgIfSfeBfLVE+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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